Oldest building in California still in use.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

Open day and night, a church with three pews and Bibles.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

The ruins of a town wiped out by the second-largest earthquake in recorded history.

Considered by many to be one of the most dangerous highways in Alaska.

During the summer, surfers in Alaska take advantage of this inlet’s unusual water patterns.

This historic collection of Native Alaskan artifacts was resurrected through a partnership between the WPA and tribal artisans.

Roadside collection of 65,000 signs.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

A music-filled, booze-soaked oasis in the desert.

Explore 10 acres of environmental sculptures.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

Towering basalt columns, a creation of fire and ice.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

This turn of the century masterpiece has a mysterious goaty interloper.

Golden Gate Park's historic collection of plants.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

San Francisco's newly reopened hands-on science museum.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.